I have a Denon DCD S-10II cd player. search all the relevant cd reclocking websites but it seems like there is nothing on clocking this player. I opened up the player and was surprised that it actually has two oscillators, both 16.934Mhz types....one very near to the receiver YM3623 chip and the other one in another area of the board.

I have successfully modified DENON DCD - 1650SR. However, I obtained service manual from DENON Spare Parts first. I suggest you do the same. Send us diagram of digital section of your player and we should be able to help you.

My 1650 uses 4 PCM1704 DACs in dual differential mode, fed by DENON '24/96 upsempler', or how they call it: 'AL24 processing'. There's 16.9344MHz xtal feeding DSP chip, which in turn generates two clock signals. First being 4.2MHz which feeds transport section, and second being 16.9344 feeding 'upsemler' chip. I have replaced the 16.9344 xtal with XO3 clock, fed the main clock signal to DSP chip, and auxiliary clock signal to upsempling chip. The result was excellent!!! However, you have to use very good external power supply for the XO3. This makes big difference.

You should be able to implement XO3 clock (or similar clock with two clock signal outputs) in your CD player. Just remember and pay particular attention to the power supply. Service Manual should not be difficult to obtain, and it will give you directions to all other upgrades possibilities, not only clock!

I think the DCD S10 is quite similar to a DCD 3000 my brother once modded.
The clock located near the reciever has no other function than helping it to recognize what sampling frequency is present on the SPDIF input. So there will be no improvement if you change this for a better one.

Just replace the second 16.9344MHz clock that feeds the decoder and alpha processor.

I think the DCD S10 is quite similar to a DCD 3000 my brother once modded.
The clock located near the reciever has no other function than helping it to recognize what sampling frequency is present on the SPDIF input. So there will be no improvement if you change this for a better one.

Just replace the second 16.9344MHz clock that feeds the decoder and alpha processor.

I still own a dcd3000-after 7 years it still sounds fantastic.i doubt i'll find anything better for the price.the difference between the 3000 & the s10 is different op amps used in the filtering section.

I have read here that you upgraded a Denon DCD. I have two of them, a DCD-755 and a DCD-1450. I tweaked the 755 with success, and I bought the 1450 non functional, for repairing. The problem should be simple, it's not spinning up the cd so the FOK signal is not there I guess. (The spindle motor is OK). I would need to know how to go to "heat run mode" or "service mode" with the player, thought you may have the service manual for th 1650, and maybe these things do not differ too much. I have a manual for the DCD-2560, but that's totally different so I just don't want to try that on the 1450.
If you have the answers to my questions any help is appreciated.
Regards,
m127

Laser diode is usually turned on by microprocessor chip. This is initialised by tray switch closed (or open). If you measure the correct laser voltage level when the tray is closed and if the spindle motor tries spinning, replace pickup.